Google Docs - Edit History
The Edit History on a Google Doc/Sheet/Slide is how you can reset the document to how it looked before - you can always go back as far in time as you need to and so work is never truly lost.
The Edit History on a Google Doc/Sheet/Slide is how you can reset the document to how it looked before - you can always go back as far in time as you need to and so work is never truly lost.